Trying to recreate an effect that envolves emission and cant get it right at all
You can do this with Volume Scattering.
In the world tab (icon of globe), under "Volume", select "Volume Scatter" from the dropdown and set up the Density and Antisotropy to be similar to mine (feel free to tweak but this should work well):

This brought my emission object from this

To this:


Again, feel free to play with any of the values shown to get it to look as you imagine!